@import "https://unpkg.com/transition-style";

div {
  inline-size: clamp(20rem, 50vmax, 75vmin);
  block-size: clamp(20rem, 50vmax, 75vmin);
  font-size: clamp(3rem, 25vmax, 50vmin);
  display: grid;
  place-items: center;
  border-radius: 100%;
  background: hsl(0 0% 85%);
}

html {
  block-size: 100%;
  inline-size: 100%;
}

body {
  min-block-size: 100%;
  min-inline-size: 100%;
  margin: 0;
  padding: 2ch;
  box-sizing: border-box;
  font-family: system-ui, sans-serif;
  display: grid;
  place-items: center;
}